As a website owner, my #1 priority is the speed with which information is loading for users, no matter where they are. There is nothing worse than dealing with slow connectivity and waiting for something to load/stream for a long time, something that will surely "disconnect" your audience from your site for a while, or even forever.

Another cool ability for CDN would probably be to perform GEO targeting (blocking content for regions, managing the resources/speeds depending on region, etc).